Condensed Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Stockholders' Equity [Abstract]
Common stock cash dividends (in usd per share)	$ 0.10	$ 0.10	$ 0.30	$ 0.30
Foreign currency, translation adjustments, tax	$ 1.5	$ (1.3)	$ 0.5	$ (1.9)
Derivatives designated as hedges, tax	(0.1)	0.0	(1.2)	(0.6)
Pension and other postretirement liability adjustments, tax	$ 0.6	$ 0.4	$ 1.5	$ 1.4